2. My music (folder for storing music);

3. E-books (e-book players); Video (for MP4 files);

4. Video (also applicable to video files); Photo (photo);

5. Received (Bluetooth transmission and downloaded files are saved here? )。

Extended data:

In modern business activities, folders are endowed with the function of image display, which can be used to store all kinds of paper documents, but not limited to this. Materials include PP, PVC and cardboard; Some are artificial leather, cloth and the like. The standard A4 file is usually available in the market.

There are many kinds of folders, including Dan Qiang folder, double folder, information book, two-inch folder, three-inch folder, double folder with different specifications, single-page folder (also called L-shaped folder), multi-page folder and so on.